期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：252
期号：2
页码：1-6
DOI：10.1088/1755-1315/252/2/022007
出版社：IOP Publishing
摘要：In this paper, a multi-passband microwave photonic filter (MPF) for sensing applications has been proposed and experimentally demonstrated. The principle is based on a microwave photonic finite impulse response (FIR) filter. Multi passband can be achieved simply by cascading two Mach-Zehnder interferometers (MZIs) with different arm length difference. The variation of the length difference of MZI will change the free spectral range (FSR) of the optical spectrum, and resulting in the frequency variation of the passbands. Thus, by changing the arm length of the MZI using variable optical delay line (VODL), a high length measuring sensitivity of -2.796 GHz/mm has been achieved. Since different passbands have different measuring sensitivity, the MPF reveals the advantages of highly sensitive, and has broad application prospects in the field of optical sensing, especially multi-parameter sensing.
